A method and device for goaf filling of a wind-blown sand multi-pipeline parallel filling

Abstract

The application discloses a kind of for aeolian sand multi-pipeline parallel filling goaf filling method and device, the method includes: in the goaf area to be filled, metal mesh box is laid out, and hydraulic support is arranged, transport main pipeline is set on the hydraulic support, multiple transport branch pipes communicated with transport main pipeline and monitoring unit;Fill material containing aeolian sand is sent into mixing box and is mixed and prepared;After mixing, filling material is transported by transport main pipeline, and is filled in metal mesh box by multiple transport branch pipes parallel conveying;Monitoring unit is used to monitor conveying parameter and / or filling parameter in filling process, and monitoring result is transmitted to control unit, and filling process is regulated by control unit;After the metal mesh box of current layer or current area is filled, the metal mesh box of next layer or next area is filled, until goaf filling is completed.The device includes hydraulic support, feeding mixing unit, conveying distribution unit, monitoring unit and control unit.The application can improve goaf filling speed and filling efficiency, enhance the supporting effect of filling body to overburden rock of goaf, improve the controllability and filling quality of filling process, and improve the safety and efficiency of coal mining.

Description

Technical Field

[0001] This invention relates to the field of goaf filling technology in underground coal mines, specifically to a method and apparatus for filling goaf with aeolian sand through multiple pipelines in parallel. Background Technology

[0002] With the increasing intensity of coal mining, the area of ​​underground goafs is constantly expanding, leading to increasingly prominent problems such as overburden movement, roof instability, and surface subsidence. To effectively control the activity of the surrounding rock in goafs, ensure the safety of underground operations, and mitigate the impact on the surface environment, goaf backfilling technology has become an important technical means for green and safe coal mining. Currently, commonly used materials for goaf backfilling mainly include gangue, paste materials, and high-water materials, and relatively mature backfilling processes and supporting equipment have been developed. In contrast, aeolian sand has advantages such as wide availability, convenient sourcing, and lower cost, especially in western mining areas where reserves are abundant, making it a potential material for goaf backfilling. However, aeolian sand has not yet developed mature backfilling processes and specialized equipment in the field of goaf backfilling. Existing backfilling systems and equipment are mainly designed for gangue, paste, or slurry materials, and are difficult to adapt to the characteristics of aeolian sand, such as fine particles, easy dispersion, and high fluidity. If conventional filling processes and equipment are directly used for aeolian sand filling, problems such as unstable material transportation, limited filling range, low filling efficiency, and unsatisfactory filling body formation are likely to occur, making it difficult to meet the requirements for rapid and efficient filling of goaf areas. Furthermore, in the exploration of using aeolian sand for goaf filling, the lack of specialized support structures, conveying devices, and filling systems adapted to underground working conditions, especially under multi-point, multi-layer, and continuous filling conditions, still presents challenges such as difficulties in multi-pipeline coordinated filling, insufficient control over the filling process, and difficulty in real-time monitoring of material usage. These issues affect the filling quality and the supporting effect of the filling body on the overlying rock of the goaf. Therefore, there is an urgent need to provide a multi-pipeline parallel filling method and device suitable for underground aeolian sand filling of goaf areas to improve the transportation stability, filling efficiency, and filling quality of the aeolian sand filling process. Summary of the Invention

[0003] The purpose of this invention is to provide a method and apparatus for filling goaf areas with aeolian sand through multiple pipelines in parallel, in order to solve the problems in the existing technology of filling aeolian sand goaf areas that lack mature technology and special equipment, and that have problems such as unstable material transportation, low filling efficiency, difficulty in multi-point layered filling, and difficulty in real-time monitoring and control of the filling process.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A method for filling goaf areas with aeolian sand using a multi-pipeline parallel filling system includes the following steps: S1. Install metal mesh boxes in the goaf area to be filled, and set up hydraulic supports. Install a main transport pipeline, multiple transport branch pipelines connected to the main transport pipeline, and a monitoring unit on the hydraulic supports. S2. The backfill material containing aeolian sand is fed into the mixing box for mixing and preparation; S3. The mixed filling material is transported through the main transport pipeline and then transported in parallel through the multiple branch transport pipelines to the metal mesh cage for filling. S4. The monitoring unit is used to monitor the delivery parameters and / or filling parameters during the filling process, and the monitoring results are transmitted to the control unit, which then regulates the filling process based on the monitoring results. S5. After the metal mesh box filling of the current layer or the current area is completed, continue to fill the metal mesh box of the next layer or the next area until the goaf filling is completed.

[0005] Further, the filling material is a mixture of aeolian sand and auxiliary filling material, preferably fly ash. The hydraulic support is used for underground roof support and serves as the mounting carrier for the main transport pipeline, transport branch pipelines, and monitoring unit; the multiple transport branch pipelines are arranged at intervals along the hydraulic support and each corresponds to one or more metal mesh cages to achieve synchronous filling at multiple points. The conveying parameters include at least one of material conveying quantity, flow rate, and pressure, and the filling parameters include at least one of filling quantity, material level, and filling state. Preferably, the filling material is conveyed pneumatically via the main transport pipeline and transport branch pipelines, and the metal mesh cages are arranged in layers to form the filling body.

[0006] This invention also provides a goaf filling device for parallel filling of aeolian sand using multiple pipelines, comprising a hydraulic support, a feeding and mixing unit, a conveying and distributing unit, a monitoring unit, and a control unit. The feeding and mixing unit is used to mix and output the filling material containing aeolian sand. The conveying and distributing unit includes a main transport pipeline mounted on the hydraulic support and multiple branch transport pipelines connected to the main transport pipeline, used to convey the filling material in parallel to multiple filling locations in the goaf. The monitoring unit is mounted on the hydraulic support and is used to monitor the conveying parameters and / or filling parameters during the filling process. The control unit is connected to the monitoring unit and is used to adjust the operating status of the conveying and distributing unit based on the monitoring results. Preferably, the feeding and mixing unit includes a mixing box for mixing aeolian sand with auxiliary filling material; the auxiliary filling material is preferably fly ash; the feeding and mixing unit may also include a conveyor belt connected to the mixing box. Preferably, metal mesh boxes are provided at the filling locations, and the metal mesh boxes are arranged in layers within the goaf to form a layered filling body.

[0007] Compared with existing technologies, this invention addresses the characteristics of underground backfilling with aeolian sand by constructing a backfilling method and device that integrates support, mixing, transportation, distribution, monitoring, and control. It enables parallel filling and layered filling of backfill materials containing aeolian sand through multiple pipelines, effectively improving the backfilling speed and efficiency in goaf areas, enhancing the quality of backfill formation, strengthening the supporting effect of backfill on the overlying rock of goaf areas, improving the controllability of the backfilling process, and further improving the safety and efficiency of coal mining. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a method and apparatus for filling goaf areas with aeolian sand using multiple pipelines in parallel.

[0009] Figure 1 In the middle: 1. Coal body; 2. Hydraulic support; 21. Main transport pipeline; 22. Branch transport pipeline; 23. Monitoring unit; 3. Mixing box; 4. Metal mesh box; 5. Conveyor belt; 6. Control unit. Detailed Implementation

[0010] The present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following embodiments.

[0011] like Figure 1 As shown, this invention provides a method and apparatus for filling goaf areas with aeolian sand using multiple pipelines in parallel, applicable to underground goaf filling operations formed after coal seam 1 mining. The apparatus mainly includes a hydraulic support 2, a main transport pipeline 21 mounted on the hydraulic support 2, multiple branch transport pipelines 22 connected to the main transport pipeline 21, a monitoring unit 23, a mixing box 3, a metal mesh box 4, a conveyor belt 5, and a control unit 6.

[0012] Hydraulic support 2 is used for underground roof support and serves as the mounting carrier for main transport pipeline 21, branch transport pipeline 22, and monitoring unit 23; mixing box 3 is used to mix and prepare filling materials containing aeolian sand; conveyor belt 5 is used to transport aeolian sand and auxiliary filling materials to mixing box 3; main transport pipeline 21 and branch transport pipeline 22 constitute a material conveying and distribution system for conveying the mixed filling materials to multiple filling locations; monitoring unit 23 is used to collect and monitor relevant parameters during the filling process; control unit 6 is connected to monitoring unit 23 and is used to regulate the filling process based on the monitoring results.

[0013] In this embodiment, the filling method includes the following steps: S1. Multiple metal mesh boxes 4 are installed in the goaf area to be filled. The metal mesh boxes 4 are used to contain filling materials and form a layered filling body. At the same time, hydraulic supports 2 are arranged along the working face at adjacent positions in the area to be filled. A main transport pipeline 21 is installed on the hydraulic supports 2, and multiple transport branch pipelines 22 are connected to the main transport pipeline 21. Each transport branch pipeline 22 is arranged at intervals along the hydraulic supports 2, and its discharge end corresponds to one or more metal mesh boxes 4, so as to realize parallel filling of multiple filling points. A monitoring unit 23 is set on the hydraulic supports 2 for real-time monitoring of the material conveying status and filling status.

[0014] S2. The backfill material containing aeolian sand is fed into the mixing box 3 for mixing and preparation. In this embodiment, the backfill material is preferably a mixture of aeolian sand and auxiliary backfill material, and the auxiliary backfill material is preferably fly ash. The aeolian sand and fly ash are conveyed to the mixing box 3 via the conveyor belt 5, and after being fully and evenly mixed in the mixing box 3, a backfill material that meets the requirements for backfilling the goaf is formed. The auxiliary backfill material is not limited to fly ash, and other materials that can improve the backfill performance can also be selected according to the actual working conditions and backfill requirements.

[0015] S3. The mixed filling material is output from the mixing box 3 and enters the main transport pipeline 21. Under the action of conveying power, it is conveyed forward along the main transport pipeline 21, and then conveyed to the corresponding metal mesh boxes 4 through multiple transport branch pipelines 22 for filling. Preferably, the filling material is conveyed by pneumatic conveying. By coordinating the main transport pipeline 21 with multiple transport branch pipelines 22, synchronous or parallel filling of multiple metal mesh boxes 4 can be achieved, thereby improving the filling speed and efficiency of the goaf.

[0016] S4. During the filling process, the monitoring unit 23 monitors the conveying parameters and / or filling parameters in real time. The conveying parameters include at least one of material conveying volume, flow rate, and pressure; the filling parameters include at least one of filling volume, material level, and filling status. The monitoring unit 23 transmits the collected parameter information to the control unit 6. The control unit 6 adjusts the conveying status in the main transport pipeline 21 and the branch transport pipelines 22 based on the monitoring results to ensure stable conveying in each branch transport pipeline 22, uniform filling of each metal mesh cage 4, and to meet preset filling requirements. Through the coordinated action of the monitoring unit 23 and the control unit 6, the automation and controllability of the filling process can be improved.

[0017] S5. After the metal mesh cage 4 in the current layer or area is filled, the filling operation for the current layer or area is terminated, and metal mesh cage 4 is continued to be laid in the area above and / or adjacent to it. The above-mentioned mixing, conveying, monitoring and control process is repeated to fill the next layer or the next area until the filling operation of the entire goaf is completed. By gradually forming a stable filling body through layering or zoning, the supporting effect of the filling body on the overlying rock of the goaf can be enhanced, and the safety of underground mining can be improved.

[0018] In this embodiment, the hydraulic support 2 not only provides roof support for the underground mine, but also serves as a comprehensive installation platform for the main transport pipeline 21, the branch transport pipelines 22, and the monitoring unit 23. This organically integrates the support system with the filling system, facilitating continuous filling operations near the goaf. The main transport pipeline 21 and multiple branch transport pipelines 22 enable the conversion of filling material from a single main transport to multi-point distribution and transport, suitable for simultaneous filling at multiple points and in multiple areas of the goaf. The monitoring unit 23 works in conjunction with the control unit 6 to provide real-time feedback and dynamic adjustment of the filling process, helping to avoid problems such as insufficient filling, uneven filling, or abnormal transport, thereby improving the filling quality.

[0019] Furthermore, the metal mesh cages 4 are arranged in layers within the goaf, and the filling material gradually forms a regular and stable mesh cage filling body after entering the metal mesh cages 4. Compared with the traditional single-point, single-pipeline filling method, this invention achieves parallel filling through a multi-pipeline conveying structure supported by hydraulic supports 2, and monitors and controls the filling process through monitoring unit 23 and control unit 6. This effectively improves the adaptability, conveying stability, and filling efficiency of aeolian sand filling, improves the forming quality of the filling body, and enhances its supporting effect on the overlying rock of the goaf.

[0020] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent substitutions or modifications made within the spirit and principles of the present invention, such as changes to the composition of the filling material, the conveying method, the type of monitoring parameters, the control method, the layout of the metal mesh cages, and the number of pipelines, shall fall within the scope of protection of the present invention.

Claims

1. A method for filling goaf areas with multi-pipeline parallel filling of aeolian sand, characterized in that, Includes the following steps: S1. Install metal mesh boxes in the goaf area to be filled, and set up hydraulic supports. Install a main transport pipeline, multiple transport branch pipelines connected to the main transport pipeline, and a monitoring unit on the hydraulic supports. S2. The backfill material containing aeolian sand is fed into the mixing box for mixing and preparation; S3. The mixed filling material is transported through the main transport pipeline and then transported in parallel through the multiple branch transport pipelines to the metal mesh cage for filling. S4. The monitoring unit is used to monitor the delivery parameters and / or filling parameters during the filling process, and the monitoring results are transmitted to the control unit, which then regulates the filling process based on the monitoring results. S5. After the metal mesh box filling of the current layer or the current area is completed, continue to fill the metal mesh box of the next layer or the next area until the goaf filling is completed.

2. The method for filling goaf according to claim 1, characterized in that: The filling material is a mixture of aeolian sand and auxiliary filling material, wherein the auxiliary filling material is fly ash.

3. The method for filling goaf according to claim 1, characterized in that: The hydraulic support is used for underground roof support and serves as the installation carrier for the main transport pipeline, the transport branch pipelines, and the monitoring unit. The multiple transport branch pipelines are arranged at intervals along the hydraulic support and correspond to one or more metal mesh boxes respectively, so as to achieve synchronous filling at multiple points.

4. The method for filling goaf according to claim 1, characterized in that: The conveying parameters include at least one of material conveying quantity, flow rate, and pressure, and the filling parameters include at least one of filling quantity, material level, and filling status.

5. The method for filling goaf according to claim 1, characterized in that: The filling material is transported by pneumatic conveying through the main transport pipeline and the branch transport pipeline, and the metal mesh cages are arranged in layers to form the filling body.

6. A goaf filling device for parallel multi-pipeline filling of aeolian sand, characterized in that, The system includes a hydraulic support, a material feeding and mixing unit, a conveying and distributing unit, a monitoring unit, and a control unit. The material feeding and mixing unit is used to mix and output the backfill material containing aeolian sand. The conveying and distributing unit includes a main transport pipeline mounted on the hydraulic support and multiple branch transport pipelines connected to the main transport pipeline, used to convey the backfill material in parallel to multiple backfilling locations in the goaf. The monitoring unit is mounted on the hydraulic support and is used to monitor the conveying parameters and / or backfilling parameters during the backfilling process. The control unit is connected to the monitoring unit and is used to adjust the operating status of the conveying and distributing unit based on the monitoring results.

7. The goaf filling device according to claim 6, characterized in that: The feeding and mixing unit includes a mixing box for mixing aeolian sand with auxiliary filling material; the auxiliary filling material is fly ash.

8. The goaf filling device according to claim 6, characterized in that: The hydraulic support is used for underground roof support and serves as the installation carrier for the main transport pipeline, the transport branch pipelines, and the monitoring unit. The multiple transport branch pipelines are arranged at intervals along the hydraulic support, and the discharge end of each transport branch pipeline is set towards different filling positions.

9. The goaf filling device according to claim 6, characterized in that: The control unit is used to adjust the material conveying status in the main transport pipeline and / or the branch transport pipeline according to the monitoring results output by the monitoring unit, so that each filling position meets the preset filling requirements.

10. The goaf filling device according to claim 6, characterized in that: The feeding and mixing unit also includes a conveyor belt connected to the mixing box. A metal mesh box is provided at the filling position. The metal mesh box is arranged in layers in the goaf to form a layered filling body.

Images